Trimethylsiloxysilylcarbamoyl Pullulan

Trimethylsiloxysilylcarbamoyl Pullulan is a modified polysaccharide—a large carbohydrate molecule derived from the fermentation of a microorganism called Aureobasidium pullulans. The ingredient combines pullulan (a naturally occurring biopolymer) with silicone chemistry to create a hybrid material with film-forming properties.In skincare formulations, this ingredient functions as a film former, creating a thin, continuous layer on the skin surface. This can help with texture, adherence of other formula components, and the overall wear and longevity of a product application.

The ingredient works by forming a continuous film across the skin surface, similar to how a thin varnish sits on a painted surface. The silicone-modified component enhances adhesion and durability, helping the film resist breakdown from moisture, movement, and environmental factors.Because pullulan itself is derived from a natural fermentation process, it is generally biocompatible and does not provoke immune responses. The film-forming action is primarily mechanical rather than biochemical, meaning it works through physical deposition rather than triggering specific skin pathways.

This ingredient is typically found in formulas designed for extended wear or enhanced texture—such as primers, foundations, or long-wear serums. It is used in small concentrations and is best applied to clean skin before other targeted treatments. Allow the formulation to set for a minute or two after application to allow the film to fully form.

Trimethylsiloxysilylcarbamoyl Pullulan is generally well-tolerated and has a strong safety profile supported by biocompatibility research. It is not known to cause irritation or sensitisation in typical cosmetic use, though those with silicone sensitivities should patch test first.